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发明授权
US07120107B1 Optical head for optical recording having a hologram element that generates multiple diffracted light beams of different orders 失效
用于光学记录的光学头具有产生不同阶数的多个衍射光束的全息元件

Optical head for optical recording having a hologram element that generates multiple diffracted light beams of different orders
摘要：
An optical head is provided, which suppresses the offset in the tracking error signal. This head comprises (a) a light source for emitting a light beam to be irradiated to an optical recording medium as an incident light beam; (b) a hologram element for receiving a reflected light beam generated by reflection of the incident light beam on the medium to generate at least two diffracted light beams for focusing error detection and at least two diffracted light beams for tracking error detection; and (c) an optical detector for detecting the at lease two diffracted light beams for focusing error detection and the at least two diffracted light beams for tracking error detection; the detector including a first receiving surface for receiving the at least two diffracted light beams for focusing error detection and a second detection surface for receiving the at least two diffracted light beams for tracking error detection; each of the first and second receiving surfaces being divided into receiving regions; the at least two diffracted light beams for focusing error detection being received at the receiving regions of the first receiving surface; the at least two diffracted light beams for tracking error detection being received at the receiving regions of the second receiving surface.
摘要（中）：

提供了一种光学头，其抑制了跟踪误差信号中的偏移。 该头包括：（a）用于发射作为入射光束照射到光记录介质的光束的光源; （b）全息元件，用于接收通过入射光束在介质上的反射产生的反射光束，以产生用于聚焦误差检测的至少两个衍射光束和用于跟踪误差检测的至少两个衍射光束; 和（c）光检测器，用于至少检测用于聚焦误差检测的两个衍射光束和用于跟踪误差检测的至少两个衍射光束; 所述检测器包括用于接收用于聚焦误差检测的所述至少两个衍射光束的第一接收表面和用于接收所述至少两个衍射光束以用于跟踪误差检测的第二检测表面; 每个第一和第二接收表面被分成接收区域; 用于聚焦误差检测的至少两个衍射光束在第一接收表面的接收区域处被接收; 用于跟踪误差检测的至少两个衍射光束在第二接收表面的接收区域处被接收。

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